Download - Traxxas Revo Manual
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MODEL 5310
owners manual
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2 Revo
Thank you for purchasing the Traxxas Revo. We believe you have
chosen the finest, most technologically advanced R/C monster truck
available. Revo proudly represents Traxxas passionate commitment
to innovation, ultimate performance, and unmatched engineering.
Revo demonstrates true state-of-the art engineering in its radically
advanced suspension, chassis, and transmission design. This new
model takes Traxxas drive anywhere, over anything mandate to a
higher level of performance authority. There is simply no other R/C
product like it.
Like an F-1 racing car, Revo is equipped with an extremely powerful,
efficient, lightweight, engine; the TRX 2.5R Racing Engine. The power
and reliability of the TRX 2.5R Racing Engine has been proven in
thousands of Traxxas models. The rear exhaust design, trick porting,
and sophisticated carburetor all come together for dramatic, high-
revving power output. Add to that the smooth convenience of the
on-board EZ-Start electric starting system and the TRX 2.5R Racing
Engine remains in a class all by itself. Revo has been carefully
engineered to keep its weight low and maintain an incredible power-
to-weight ratio and seemingly perfect performance balance. You can
expect quick acceleration to speeds in excess of 40mph (64.37 kph).
With all of this high-end technology jammed between the wheels of
your new Revo, its very important that you take some time to read
through these instructions. This manual contains all the necessary
set-up, break-in, tuning, and operating procedures that allow you to
unlock the incredible performance and adjustment potential built
into Revo. Even if you are an experienced R/C enthusiast, itsimportant to read and follow the procedures in this manual. Revo
contains new technologies in the engine, suspension, and
transmission operation that you may not be familiar with. Pay
particular attention to the fuel and break-in requirements for the
engine. The advanced design of the TRX 2.5R Racing Engine does
not follow old-fashioned thinking regarding fuel and
break-in procedures.
3
4
5
6
7
8
9
18
33
34
40
42
46
Before You
Proceed
Safety
Precautions
Tools, Supplies
and Required
Equipment
Anatomy of Your
Revo
Quick Start:
Getting Up to
Speed
Gluing the Tires
and Decorating
Your Revo
The Traxxas
TQ-3 Radio
System
The TRX 2.5R
Racing Engine
Driving
Your Revo
Basic Tuning
Adjustments
Maintaining
and Storing
Your Revo
Advanced Tuning
Adjustments
Index
Introduction
Traxxas Support
Traxxas support is with you every step of the way.
Refer to the next page to find out how to contact
us and what your support options are.
Quick StartThis manual is designed with a Quick Start path
that covers only the necessary procedures to get your model
up and running in the shortest time possible. If you are an
experienced R/C enthusiast you will find it helpful and fast.
Be sure and read through the rest of the manual to learn
about important safety, maintenance, and adjustment
procedures. Turn to page 7 to begin.
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Revo 3
Carefully read and follow all instructions in this and any accompanying
materials to prevent serious damage to your Revo. Failure to follow
these instructions will be considered abuse and/or neglect.
Before running your Revo, look over this entire manual and examine the
truck carefully. If for some reason you decide Revo is not what you
wanted, then do not continue any further. Your hobby dealer absolutelycannot accept a Revo for return or exchange after it has been run.
Warnings, helpful hints, & cross-references
Throughout this manual, youll notice warnings and helpful hints
identified by the icons below. Be sure to read them!
An important warning about personal safety or avoiding
damage to your Revo and related components.
Special advice from Traxxas to make things easier and more fun.
Refers you to a page with a related topic.
Support
If you have any questions about your Revo or its operation,
call the Traxxas Technical Support line toll-free at:
1-888-TRAXXAS (1-888-872-9927)*
Technical support is available Monday through Fri day from 8:30 am
to 9:00 pm central time. Technical assistance is also available atwww.Traxxas.com. You may also e-mail customer support with your
question at [email protected]. Join hundreds of Traxxas R/C
enthusiasts in our online community at Traxxas.com.
Traxxas offers a full-servic e, on-site repair facility to handle any of
your Traxxas service needs. Maintenance and replacement parts
may be purchased directly from Traxxas by phone or online at
www.BuyTraxxas.com. You can save time, along with shipping and
handling costs, by purchasing replacement parts from your local dealer.
Traxxas
1100 Klein RoadPlano, Texas 75074
Phone: 972-265-8000
Toll-free 1-888-TRAXXAS
Traxxas U.K.
P.O. Box 1128Winterbourne, Bristol
BS17-2SH
EnglandPhone: 44-117-956-1002
Internetwww.Traxxas.com
E-mail: [email protected]
Entire contents 2004 Traxxas.
Traxxas, Revo, TRX 2.5R Racing
Engine, TQ-3, Top Fuel,
EZ-Start, Ready-To-Race,Ready-To-Win, and ProGraphix
are trademarks or registeredtrademarks of Traxxas. Other
brand names and marks are
the property of theirrespective holders and are
used only for purposes of
identification. No part of thismanual may be reproduced
or distributed in print or
electronic media without theexpress written permission
of Traxxas.
Before You Proceed
*Toll-free support is available to U.S. r esidents only.
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All of us at Traxxas want you to safely enjoy your new Revo. Operate
your Revo sensibly and with care, and it will be exciting, safe, and fun for
you and those around you. Failure to operate your Revo in a safe and
responsible manner may result in property damage and serious injury.
The precautions outlined in this manual should be strictly followed to
help ensure safe operation. You alone must see that the instructions are
followed and the precautions are adhered to.
Important Points to Remember
The engine, exhaust system, and brakes may become extremely
hot during use.
Model engine fuel is dangerous and highly poisonous. Always
follow all directions and precautions printed on the fuel container.
Model engine fuel, especially when in a fuel dispensing bottle, may
look like a cool drink to a child. Keep all fuel out of the reach of
children at all times. Do not place fuel containers on the ground
where children can get to them while you are driving.
Model engine fuel is flammable. Never allow smoking, sparks, heat or
flame in the presence of fuel or fuel vapors.
The engine and exhaust system may become extremely hot during
use. Be careful not to touch the parts, especially when refueling or
stopping the engine.
Prolonged exposure to the engine exhaust can be harmful. Avoid
breathing the engine exhaust. Always run your Revo outdoors, in a
well-ventilated area. Never run the engine indoors.
Do not operate your Revo at night, or anytime your line of sight to the
model may be obstructed or impaired in any way.
Never operate your Revo in crowds of people or busy pedestrian
areas. Revo is large and fast, and could cause injury to those unaware
of its presence.
Because Revo is controlled by radio, it is subject to radio interference
from many sources beyond your control. Since radio interference can
cause momentary loss of control, always allow a safety margin in all
directions around your model to prevent collisions.
The engine can be loud. If the noise makes you uncomfortable, wear
ear protection. Be considerate of your neighbors by not running yourmodel early in the morning or late in the evening.
Most importantly, use good common sense at all times.
4
Revo
Safety Precautions
All instructions andprecautions outlined in this
manual should be strictly
followed to ensure safeoperation of your Revo.
Revo is not intended for use
by children under 16 yearsof age without the
supervision of a responsible
and knowledgeable adult.
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Revo
5
Your Revo comes with a set of specialty metric tools. Youll need to purchase other items, available from your hobby dealer, to operate and maintain your model.
Tools, Supplies and Required Equipment
Supplied Tools and Equipment
RX Power ChargerRX battery power pack
(installed in model)RX Power plug (transformer)
8 AA alkaline batteries
(see page 23)
Hobby knife
Traxxas Top Fuel
see page22
Fuel dispensing bottle Small flat-blade screwdriverfor tuning (1/8 inch blade)
After-run oil to protectthe engine from corrosion
10% quart - #5010
20% quart - #5020
10% gallon - #5060
20% gallon - #5070
For more information on
batteries, see Use the RightBatteries on page 11.
A peak-detecting chargeris recommended for best
performance and longest
battery life. Inexpensivewall chargers may also be
used with very good
results. For moreinformation, see Use the
Right Chargeron page 26.
NiCad or NiMh7.2V battery pack
NiCad or NiMhbattery charger
Philips screwdriver
Suspension multi-tool Glow plug andwheel nut wrench
1.5mm L wrench 2.0mm T wrench 2.5mm T wrench
8mm slipper clutch wrenchShock wrench 5mm turnbuckle wrench 4-way wrench
Suspension tuning shimsand hollow balls
Long Travel rocker and spring set
Required Tools and Equipment
2.5mm L wrench
Recommended Equipment
These items are not
required for the operation
of your model, but are agood idea to include in any
R/C toolbox:
Safety glasses
Thin, hobby-quality
cyanoacrylate instant tireglue (CA glue)
Side cutters or needle
nose pliers
Foam air filter oil andextra oiled air filter element
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6
Revo
Anatomy of Your Revo
Fuel Tank
Fuel Cap
Steering Servo
Shifting Servo(inside box)
Suspension Arm
BumperBumper Mount
Skid Plate
Oil Shock (Damper)
Differential(under chassis)
Toe Link (Turnbuckle)
Throttle/Brake
Servo (inside box)
Transmission
Air Filter
Tuned Pipe
Exhaust Header
TRX 2.5R Racing Enginesee pg.19 for details
Pressure Line
Fuel Line
EZ-Start Motor
EZ-Start Plug
Bulkhead(under chassis)
Body Mount Post
SpurGear
Chassis
SlipperClutch
Driveshaft (Half Shaft)
On/Off Switch
Shift Rod
Antenna Mount
Access Plug(for two-speed adjustment)
5-cell RX Power Pack(inside box)
Pipe Hanger
Receiver Box
OptiDrive ElectronicShift Module
Engine Shut-off Clamp
Roll hoop
Rocker
Push Rod
Pivot Ball
Hex Hub
Axle Carrier
Spring Pre-load Adjuster
Steering Servo
Disc Brake
Brake TensionAdjuster
Charging Jack(underneath)
Fuel CapHandle
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Revo
7
Quick Start: Getting up to Speed
The following guide is an overview of the procedures for g etting your Revo running, from opening the box to breaking in and tuning your engine.
Refer to the pages indicated for details on each step. Look for the Quick Start logo on the bottom corners of Quick Start pages.
1. Read the safety precautions on page 4
For your own safety, understand where carelessness and misuse
could lead to personal injury.
2. Charge the EZ-Start battery pack See page 26
The EZ-Start requires a fully charged 7.2-volt battery
pack (not included).
3. Charge the RX Power Pack See page 12
The 5-cell receiver bat tery is already installed in the truck. Plug the
supplied charger into the charging jack on the truck.
4. Install the antenna See page 13.
Install the antenna mast in Revo.
5. Decal and Install the body See page 8
You will need to use the body during break in, so it's best to apply
any additional decals before you use the body.
6. Install batteries in the transmitter See page 11
Revo requires 8 AA alkaline or rechargeable batteries
for the transmitter.
7. Install the EZ-Start battery See page 26
Install and connect a charged 7.2-volt battery pack in
the EZ-Start controller.
8. Turn on the radio system See page 16
Make a habit of turning the transmitter on first, and off last.
9. Check servo operation See page 17
Make sure the throttle, shifting, and steering servos are working
correctly.
10. Range test the radio system See page 17
Follow this procedure to make sure your radio system works properly
at a distance and that there is no interference from outside sources.
11. Fill the fuel tank See page 22
Use your fuel-dispensing bottle to fill the tank.
12. Connect the EZ-Start to the model See page 27
Learn the proper way to use the EZ-Start electric starting system
13. Start the engine See page 28
Learn to use the correct starting procedure for your TRX 2.5R.
14. Break-in your engine See page 28
Follow the break-in instructions exactly to ensure the
best-performing, longest-lasting engine.
15. Tune your engine See page 30
Learn how to set the fuel mixture needles for optimum
engine performance.
16. Drive your Revo See page 33
Learn to use the two-speed and reverse function on your truck,
along with important driving precautions.
17. Maintaining your Truck See pages 40-41
Follow these critical steps to maintain the performance of your
Revo and keep it in excellent running condition.
The Quick Start Guide isnot intended to replace
the full operating
instructions available inthis manual. Please read
this entire manual for
complete instructionson the proper use and
maintenance of
your Revo.
Look for the Quick Startlogo at the bottom of
Quick Start pages.
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Applying The Decals
The main decals have al ready been
applied to your Revo. The extra decals
provided are die-cut for easy removal.
Use a hobby knife to lift the corner of
a decal and remove it from the
backing.
Carefully position the decal over the
desired location and press one side on
the body. Pull the decal tight and use
a finger to gradually smooth out any
air bubbles as you apply the decal.
Look at the photos on the box for
typical decal placement.
Tire Gluing
The factory tires on your Revo are already glued to the rims. The tires
must be glued to the rims to prevent the rims from spinning inside the
tires. The instructions here are provided to show you how to glue
replacement tires to the rims in the future. Use CA tire glue available
from your local hobby dealer. You can glue the tires without removing
the wheels from the truck. For clarity, these instructions show theprocess with the wheels removed.
8 Revo
Gluing the Tires and Decorating your Revo
1. Remove a wheel from Revo
using the larger (8mm) end of
the glow plug (universal)
wrench.
2. Use your thumb to push the side
of the tire away from the rim.
Place one or two drops of CA
glue into the opening and
release the tire. Capillary action
will draw the glue around the
bead of the tire.
3. Repeat step two at four or five
points around the rim, until the
tire is completely secured to the
rim. Turn the rim over and repeat
the process for the inside of the
rim/tire. Repeat for the other 3
wheels.
4. Reinstall the wheels, make sure
none of the axle pins have fallen
out from behind the hex hubs.
Always wear safety glassesto prevent glue from
splattering into your eyes.
The acetone in fingernailpolish remover will
remove excess glue from
your fingers.
For best results while
gluing, clean the bead of
the tires and the groovesof the wheels with
denatured alcohol before
applying glue. This
removes any mold releaseagent residue from the
tires and wheels,providing a better bond.
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CH3
CH2
CH1
Revo 9
The Traxxas TQ-3 Radio System
Your Revo is equipped with the TQ-3 radio system. The TQ-3 is a 3-channel system that provides up to a quarter mile range and control for up to three
servo outputs. Revo is equipped with two high-torque steering servos connected via a Y plug adapter (one input, two equal outputs). The TQ-3 works
in conjunction with the OptiDrive Electronic Shift Module to monitor and control the input and output signals for the throttle and shifting servos
(channels). The OptiDrive monitors the voltage of the on-board RX Power Pack. The "Function" LED will flash red if the battery voltage is too low.
AntennaThrottle Neutral Adjust
Steering Wheel
Throttle Trim
Steering Trim
Reverse Shift
Forward Shift
Power Switch Power IndicatorBattery Compartment
Servo ReversingSwitch
ThrottleTrigger
Revo Wiring Diagram
Antenna
On/OffSwitch
Receiver
RX Power Pack5-cell NiMh
Battery
Steering Servos
Throttle Servo
Shifting Servo(micro servo)
The OptiDrive ESM isdesigned to adapt and
work with aftermarket
three channel radiosystems (see page 15).
OptiDrive ESM(Electronic Shift
Module)
BatteryChannel 1
Charging Jack(to charger)
Channel 2
Channel 3
TQ-3 Transmitter
To Transmission(OptiDrive sensor)
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10 Revo
Radio System TerminologyPlease take a moment to familiarize yourself with these radio-systemterms. They will be used throughout this manual.
5-Cell Pack Another term for RX Pack. The RX pack is made up of five2/3 AA rechargeable NiMH battery cells.
Channel - The 27 MHz frequency band is divided into 6 channels so thatup to six models can be operated simultaneously. Each channel isreferred to by its flag color and channel number, as shown below.
Clearing your frequency - A routine, verbal check to make sure nobodyelse in your area is operating on the same channel. Always clear yourfrequency by calling out your channel number before operating yourmodel. Wait or move to another area if your channel is already beingused.
Crystal (X-tal) - The plug-in device that determines which channel theradio system will operate on. For each channel, there are two crystals,one for the receiver and one for the transmitter. Of those two crystals,the one marked with the lower number (.455 MHz lower) must beinserted into the receiver.
Frequency band - The radio frequency used by the transmitter to sendsignals to your Revo. All Traxxas RTR models operate on a 27 MHzfrequency band.
mAh Abbreviation for milliamp hour. Measure of the capacity of thebattery pack. The higher the number, the longer the battery will lastbetween recharges.
Neutral position - The standing position that the servos seek when thetransmitter controls are at the neutral setting.
NiCad - Refers to rechargeable, nickel-cadmium batteries. The mosteconomical choice, since they may be recharged up to 500 times.
NiMh Abbreviation for Nickel Metal Hydride. This is the type of
rechargeable battery used to power the radio system in the model.These batteries are generall y more efficient with less memory effectthan NiCad batteries.
OptiDrive ESM Electronic Shift Module. The onboard electroniccontroller that monitors vehicle speed and throttle position in order tocontrol the action of the shifting servo. Also includes low batteryindicator for the onboard receiver pack (RX Power Pack).
Receiver - The radio unit inside your Revo that receives signals from thetransmitter and relays them to the servos.
RX Pack RX is a common abbreviation for the radio receiver and items
associated with it. RX-Pack denotes the rechargeable battery pack usedto power the radio system in the model.
Servos - Small motor units in your Revo that operate the throttle,shifting, and steering mechanisms.
Three-channel radio system - The TQ-3 radio system, consisting of thereceiver, the transmitter, and the servos. The system uses threechannels: one to operate the throttle, one to shift the transmission,and one to operate the steering.
Transmitter - The hand-held radio unit that sends throttle and steeringinstructions to your Revo.
Trim - The fine-tuning adjustment of the neutral position of the servos,made by turning the throttle and steering trim knobs on the face ofthe transmitter.
Y Adapter Servo cable adapter that takes one input signal and directsit to two equal output signals. Used to connect dual steering servos tothe channel one receiver output.
The Traxxas TQ-3 Radio System
Channel Frequency
Band
Flag
Color
Traxxas
Part No.
1 26.995 Brown 2031
2 27.045 Red 2032
3 27.095 Orange 2033
4 27.145 Yellow 2034
5 27.195 Green 2035
6 27.255 Blue 2036
Learn terms related to the
TRX 2.5R Racing Enginebeginning on page 20.
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Installing Transmitter Batteries
Your TQ-3 transmitter uses 8 AA batteries. The battery compartment is
located in the base of the transmitter.
1. Remove the battery compartment door by pressing the tab and
lifting the door up.
2. Install the batteries in the correct orientation as indicated in the
battery compartment.
3. Reinstall the battery door and snap it closed.
4. Turn on the transmitter and check the power indicator for a
solid red light.
If the power indicator light flashes, then the transmitter batteries are
weak, discharged or possibly installed incorrectly. Replace with new or
freshly charged batteries. The power indicator light does not indicate
the charge level of the RX Power Pack installed in the model.
Revo 11
The Traxxas TQ-3 Radio System
CH3
CH2
CH1
Use the Right BatteriesYour transmitter uses AAbatteries. Use new alkaline
batteries, or rechargeable
batteries such as NiCad orNiMh (Nickel Metal Hydride)
batteries in your
transmitter. Make surerechargeable batteries are
fully charged according to
the manufacturersinstructions.
If you use rechargeablebatteries in your
transmitter, be aware
that when they beginto lose their charge, they
lose power much more
quickly than regularalkaline batteries.
Caution: Discontinue
running your Revo at thefirst sign of weak batteries
(flashing red light) to avoid
losing control.
If the power indicator
doesnt light red, check thepolarity of the batteries.
Check rechargeable
batteries for a full charge.
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Charging the Receiver Batteries
To power the radio system
in the truck, your Revo is
equipped with the RX
Power Pack, a rechargeable
5-cell nickel metal hydride
(NiMh) battery pack. The RXPower Pack must be fully
charged before running the
truck. The supplied RX
Power Charger is a peak-
detecting unit that will
charge the supplied RX
Power Pack in about 1 hour.
The peak detection circuit ry
automatically shuts off the charger when the maximum charge has been
achieved. Revo has a built in charging jack so you do not have to remove
the battery pack from the model. The long charger cord allows easy
handling of the truck while the battery is charging.
1.The RX Power Charger ca n operate on either A/C or D/C power*. An
A/C power supply is supplied with Revo. Plug the end of the A/C
adapter into the back of the charger.
2. Plug the A/C power supply into any 110 volt wall outlet. The charger
light should glow steady green (no battery connected).
3. Plug the charger output cord into the charging jack located under the
right front of the truck. The charging jack is
protected by a rubber plug.
4.The green light on the charger should begin
to flash quickly indicating that fast chargingis in progress.
5. When the light turns solid green (not
flashing) the battery pack is fully charged
and ready for use.
6. Put the rubber plug back over the charging
jack on the truck.
After fast charging has completed, the RX
Power Charger continues to charge in
trickle (slow) charge mode. It will continue
until the battery is disconnected. The RX
Power Charger will automatically shut off
after 90 minutes of fast charging time.
When the charger is not in use, wind the
charging cord around the cord holder.To secure the cord, insert the end of it into
the retaining slot on either end of the cord holder. The RX Power
Charger is equipped with mounting holes in the back of the
case to allow convenient, out-of-the-way wall mounting.
The RX Power Charger c an be powered by our
optional D/C car adapter. It features a tangle-
free, extra long wire and integrated fuse. The
long charging cord allows the model to remain
outside the car while charging. Caution! Never
charge batteries in an enclosed car interior or
while driving. Never leave charging batteriesunattended. Monitor them closely.
Battery Care
Some precautions should be taken to maintain the performance of the
rechargeable NiMh receiver pack in your model. Improper use of the
battery pack could result in personal injury or damage to your truck.
Only use approved chargers for NiMh battery packs (such as the Traxxas
RX Power Charger). Do not exceed the maximum charge rate of 1 amp.
Do not short circuit the battery pack. This may cause burns and severe
damage to the battery pack
Do not burn or puncture the batteries. Toxic materials could be released.If eye or skin contact occurs, flush with water.
Store the battery pack in a dry location, away from heat sources and
direct sunlight.
Nickel Metal Hydride batteries must be recycled or disposed of properly.
Do not completely discharge the RX Power Pack or you could damage
it. Do not use dischargers on the pack. Store the battery with at
least 25% charge. Stop running and recharge at the first indication
of reduced voltage.
12 Revo
Important: When a
rechargeable batterypack begins to lose its
charge, it will lose power
much quicker than non-rechargeable batteries.
To prevent losing controlof your model, you muststop driving immediately
at the first sign of weak
batteries. A flashing red LEDon the OptiDrive ESM
indicates low voltage.
Other indications of weakon-board batteries
include sluggish steering
response and shortenedradio range.
Charger Specifications:
Input voltage:
10.6/16v (min/max)
Fast charge current:
750/1000mA (min/max)
Slow (trickle) charge current:22/55mA (min/max)
Delta Peak:
10mv
Maximum charge time:90 minutes
The Traxxas TQ-3 Radio System
* With optional D/C car adapter
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Setting up the Antenna
1. Locate the black antenna wire that exits the receiver cover. The
receiver cover is mounted on the top of the chassis, near the front.
The antenna wire exits the cover just ahead of the fuel tank.
2. Pull the wire straight with your fingers and then insert the end ofthe wire into one end of the antenna tube. Push the wire all the way
through the antenna tube.
3. Insert the base of the tube into the molded post on the side of the
radio box.
4. Place the antenna tip over the top of the tube to secure the
antenna wire.
5. On the transmitter, always fully extend the telescoping antenna when
running your Revo. Make a habit of holding the transmitter so that the
antenna points straight up.
Revo 13
The Traxxas TQ-3 Radio System
Spray a little windowcleaner on the antenna
wire to make it easier
to push through theantenna tube.
Dont shorten the length
of the antenna wire. Itslength is tuned to the
frequency band; cutting it
could severely shorten theradio systems range.
Dont push the
transmitter antenna down
from the top. Pull it downfrom the bottom, one
segment at a time, toprevent binding and
kinking the antenna mast.
Antenna Tip
Antenna Tube
Front ofTruck
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14 Revo
Steering
TURN
LEFT
TURN
RIG
HT
Brake
Neutral
Accelerate
CH.3
CH.2
CH.1
Shift Reverse
Shift Forward
TQ-3 Radio System Controls
The Traxxas TQ-3 Radio System
TQ-3 Radio System Adjustments
In addition to the electronic throttle and steering trim controls, your
radio system features throttle neutral adjustment and servo reversing
switches.
Throttle Neutral AdjustmentThe throttle neutral adjustment is located on the t ransmitter face and
controls the forward/reverse travel of the throttle trigger. Change the
adjustment by pressing the button and sliding it to the desired position.
There are two settings available:
50/50: Allows equal travel for both acceleration and braking.
70/30: Allows more throttle travel (70%) and less
brake travel (30%).
50/50 is the required setting for Revo with the TRX 2.5R Racing Engine.
Electronic Throttle TrimThe electronic throttle trim located on the fa ce of the transmitter adjusts
the neutral (center) point of the throttle servo when the servo is at rest.
This control has been preset for you at the fa ctory. If necessary, adjust
the control so that the carburetor is at idle, and the brakes are not
applied (the model will roll freely). Do not use the throttle trim to raise
or lower the engine idle speed. Make the idle speed adjustment on the
carburetor.
Electronic Steering TrimThe electronic steering trim located on the fac e of the transmitter
adjusts the neutral (center) point of the steering servos when the servos
are at rest. Adjust this control to make the model drive straight with no
steering input at the wheel.
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Revo 15
Servo Reversing SwitchesThe servo reversing switches are located on the front of the transmitter,
next to the on/off switch. Moving a switch reverses the direction of the
corresponding servo. Each switch corresponds to a channel, as shown
below. For example, if you turn the steering wheel to the right and your
front wheels turn left, you would move the channel 1 switch to correct
the servo direction. It may be necessary to adjust the corresponding trim
control after
moving a switch.The default
position for the
servo reversing
switches is
shown.
Programming the OptiDrive ESMThe OptiDrive ESM electronically monitors
vehicle speed and controls forward and reverse
shifting. Controlling the shift action electronically
rather than by mechanical systems reduces the
number of components in the transmission. The
transmission weighs less, there is lower
rotational mass for quicker acceleration, and
constant drive engagement for smooth power delivery.
The OptiDrive module prevents the transmission from changing
directions while the truck is in motion. The truck must be completely
stopped to change directions, regardless of the position of the shift
selector switch on the transmitter. The OptiDrive module is preset at the
factory. If the transmitter throttle trim adjustment is changed, then the
OptiDrive module will need to be re-programmed.
1.The engine must be shut off. The radio system must be on (receiver
and transmitter).
2. Set the TQ-3 Transmitter to its factory default shift settings:
Set the THROTTLE NEUTRAL switch to the 50/50 setting.
Set the THROTTLE TRIM to the center 0 setting, then adjust the
THROTTLE TRIM until the carburetor closes.
Set the CHANNEL 2 SERVO REVERSING SWITCH to the right position.
Set the CHANNEL 3 SERVO REVERSING SWITCH to the right position.
DO NOT change the position of any of the servo reversing switches
after programming the OptiDrive. If settings were changed after
programming the OptiDrive, it will have to be reprogrammed.
3. With the throttle at neutral, press and hold the
SET button until the Function LED flashes green
twice and then release the button immediately.
You are now in programming mode.
4. Pull the transmitter throttle
trigger to the full throttle
position. Hold it there until the
Function LED flashes green
three times. Note:The throttleservo will not move during programming even though it is connected
to the controller.
5. Release the transmitter throttle
trigger allowing it to return to
neutral. The Function LED will
turn solid green, indicating that
the shifting servo is OK to shift
and the programming has been completed. The controller is now
programmed and ready to go!
If the transmitter throttle settings are changed, it will be necessaryto complete the programming sequence again.
If the SET button is released before the Function LED flashes
green twice in step 3, the OptiDrive will return to the normal
operation mode.
If you experience any problems during programming, turn the
receiver off, then on again, and repeat the programming steps.
For instructions on how to use the OptiDrive with aftermarket radio
systems, or to access advanced programming options, visit our website,
www.Traxxas.com.
CH.3
CH.2
CH.1
Channel Servo
1 Steering
2 Throttle and braking
3 Shifting
The Traxxas TQ-3 Radio System
Large adjustments to thethrottle trim and/or throttle
linkage may require
re-setting the OptiDriveESM to maintain proper
shifting action.
TQ-3 Channel to Servo Chart
For transmission durability,
the OptiDrive ESM limitsthe models reverse speed
to about 70% of full
throttle. If settings arechanged, and you notice a
decrease in forward top
speed, you could have theOptiDrive system reversed.
Return the TQ-3 servo-
reversing switches for
channels two and threeback to their default
settings and re-program theOptiDrive Module. For
programming with
aftermarket radio systems,please see our website.
Green FunctionShift allowed
Red flashing Function
Low battery, see pg. 12
Red SensorSensor circuit is broken.Possible disconnected
sensor, broken wires, ordamaged sensor.
Blue flashing Sensor
Normal operation asvehicle moves. Indicatessignal pulse from sensor.
Depending on the rotorposition, solid blue or offwhen vehicle is at rest.
OptiDrive Operation
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16 Revo
TQ-3 Radio System Rules
Each time you prepare to run your Revo,
you must clear your frequency to be sure
no one else in the area is using the same
channel as you.
There are six possible channe ls, numbered1 through 6. Each is represented by a color.
Look at the crystal plugged into the back of
your transmitter to determine which
channel your truck is assigned to.
Always turn your TQ-3 transmitter on first
and off last. This procedure will help to prevent your Revo from
receiving stray signals from another transmitter, or other source,
and running out of control.
Always have the transmitter and receiver turned on before you start
the engine. Never turn the radio system off while the engine is
running. The on/off switch in the model only turns the receiver on
and off. It does not turn off the engine.
Always use new or freshly charged batteries for the transmitter, and
make sure the on-board 5-cell NiMh battery pack is fully charged. The
function light on the OptiDrive will flash red if the 5-cell battery pack
requires charging. Weak batteries will limit the range of the radio
signal between the receiver and the transmitter. Loss of the radio
signal can cause you to lose control of your Revo.
Channel 1Brown
Channel 2Red
Channel 3
Orange
Channel 4Yellow
Channel 5Green
Channel 6Blue
CH3
Always turn your transmitter o n first. Always turn your receiver o n second. Then start your engine.
1 2 3
Remember, always turn the
TQ-3 transmitter on firstandoff lastto avoid damage to
your Revo. Never turn the
radio off while the engine isrunning.
The Traxxas TQ-3 Radio System
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Using the TQ-3 Radio System
The TQ-3 Radio System was pre-adjusted at the factory. The adjustment
should be checked before running the model, in case of movement
during shipping. Heres how:
1. Fully extend the chrome antenna mast on the transmitter and turn
the switch on. The red indicator light on the transmitter should besolid red (not flashing).
2. Turn on the receiver switch in the model. The switch is located in the
top of the radio compartment. The function light on the OptiDrive
ESM should be green. A red flashing LED indicates low voltage in the
RX Power Pack. The sensor LED is intermittent depending on the
rotor position.
3. Position Revo so that its front wheels are off the ground.
4. Turn the steering wheel on the transmitter back and forth and check
for rapid operation of the steering servo. Also, check that the steeringmechanism is not loose or binding. If the steering operates slowly,
then check the receiver pack to make sure it is fully charged.
5. When looking down at model, the front wheels should be pointing
straight ahead. If the wheels are turned slightly to the left or right,
slowly adjust the steering trim control on the transmitter until they
are pointing straight ahead.
6. Operate the throttle trigger on the transmitter and check for rapid
operation of the throttle servo. When the throttle trigger is pulled
back, the carburetor should open (slide moves out). When the
throttle trigger is pushed all the way forward, the brake should lock.
7. Operate the shift button on the transmitter and check for rapid
operation of the shifting servo. Push the shift button down forforward. The servo will operate the spring-loaded shift mechanism
and you will hear the transmission click into forward. Push the shift
button up for reverse and you will again hear the transmission click
and shift into gear.
8. Once adjustments are made, turn off the receiver on your Revo,
followed by the hand-held transmitter.
Range-Testing the TQ-3 Radio System
Before each running session with your Revo, you should range-test your
radio system to ensure that it operates properly.
1. Turn on the radio system and che ck its operation as described in the
previous section (Using the TQ-3 Radio System).
2. Have a friend hold the model with the engine off.
3. Make sure your transmitter antenna is fully extended, and then walk
away from the model with the transmitter until you reach the farthest
distance you plan to operate the model.
4. Operate the controls on the transmitter once again to be sure that
the model responds correctly.
5. Do not attempt to operate the model if there is any problem with the
radio system or any external interference with your radio signal at
your location.
Revo 17
The Traxxas TQ-3 Radio System
When the engine isrunning, dont use the
throttle trim on the
transmitter to adjust theengine idle speed. Instead,
use the idle speed
adjustment on thecarburetor.
Dont attempt to operateyour Revo if there are any
problems with your radio
system or radio interferenceat your location.
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Introduction
Theres nothing like the TRX 2.5R Racing Engine in your new Revo.
The TRX 2.5R Racing Engine is a specialty high-performance racing
engine. Its impressive performance is the result of years of focused
engineering development, and thousands of hours of controlled testing
and rigorous real-world running. It offers unprecedented power and
performance that turns ready-to-run into Ready-To-Race.
The TRX 2.5R Racing Engine takes a total-system approach. Each part of
the engine, from the air filter to the exhaust tip, is carefully engineered
to work in harmony with other engine components. Each part
complements the next, to extract maximum power. The TRX 2.5R Racing
Engine is designed to be tolerant of variations in tuning, and to run
successfully through a wide range of variable atmospheric conditions
such as changes in temperature, humidity, and altitude.
In order to get the longest engine life and keep the TRX 2.5R Racing
Engine in top running condition, it is very important to perform regular
routine maintenance. The number one cause of premature engine
wear and failure is lack of care and maintenance!
Break In
The TRX 2.5R Racing Engine is manufactured to exacting tolerances and
requires a specially-designed break-in procedure to accomplish the final
precision fitting of the internal engine components. It is very important
that you follow the new break-in procedure as closely as possible to
achieve the best performance and longest life from your TRX 2.5R Racing
Engine. Engine break-in will take between one and two hours. Old style
break-in procedures, such as idling the engine on the bench for several
tanks of fuel or simply running the engine with a very rich fuel mixture
for the first 4 tanks of fuel, will not achieve the best results. Follow theeasy steps in this manual.
Air Filter Maintenance
A clean air filter is critical for long engine life. Due to the high-
performance nature of the TRX 2.5R Racing Engine, a tremendous
amount of vacuum is created to move a large volume of high-velocity air
through the carburetor. Dirt is the worst enemy to your engine. Clean
the air filter after each hour of running to prevent sucking dirt into the
engine. Extra pre-lubed filter elements have been provided to encourage
you to maintain your air filter.
After-Run Maintenance
Perform after-run maintenance on the engine to prevent corrosion
from building up on the internal engine components. The fuel
naturally attracts moisture and corrosion can build up very quickly
inside the engine if it is not prevented.
A few minutes spent before and after each time you run your model
will allow you to enjoy it for a long time to come. Read on for more
exciting details about your new engine.
18 Revo
The TRX 2.5R Racing Engine
Traxxas strongly
discourages changing ormodifying any part of the
TRX 2.5R Racing Engine.
Old tech tips and tricks thatmay have boosted the
power of other enginescould seriously diminishthe performance of the
TRX 2.5R Racing Engine.
Theres more advanced
thinking, development and
testing in the stock parts ofyour TRX 2.5R Racing
Engine than in many
aftermarket manufacturersperformance parts. The
TRX 2.5R Racing Engine is
already the most powerful
engine in its class andsimply will not benefit
from average, low-tech,aftermarket bolt on
performance items.
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Revo 19
The TRX 2.5R Racing Engine
TRX 2.5R Racing Engine IllustratedAir FilterBase Head Protector
PowerTune head
(Cylinder head)
EZ-Start Drive Unit
EZ-Start Motor
Engine Mount
Low-Speed Needle
Throttle ArmClutch Bell
Flywheel
Carburetor
Air Intake
Fuel Intake
High-SpeedNeedle
Idle SpeedScrew
EZ-Start Plug
Positive Wire
Negative WireFuel Line
Fuel Tank
Tuned Pipe
Exhaust Tip
Pressure Line
Ground Wire
Glow Plug Wire
EZ-StartController
Crankshaft
Crankcase
EngineShut-offClamp
Header
Air FilterHousing
Revos fuel tank is equipped
with a built-in sintered
bronze fuel filter.
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Terms to Know
Youll find these Nitro R/C engine terms throughout this section of the manual.
.15 - .15 or 15 refers to the displacement of the engine. The TRX 2.5R
Racing Engine is .15 cubic inches or 2.5 cubic centimeters (cc). The name
TRX 2.5R is derived from the cc measurement.
ABC - Abbreviation for aluminum, brass, and chrome. Refers to engine
construction that consists of an aluminum piston that slides in a chrome-plated brass sleeve. The TRX 2.5R Racing Engine uses ABC construction.
Air filter - The air filter sits atop the carburetor and prevents harmful dust
and dirt from entering the engine. Dirt ingestion is the number one cause
of premature engine failure so the engine should never be run without the
air filter in place.
Big Block .15 - A .15 (2.5) engine that uses a larger crankcase size and longer
stroke than typical .15 engines. Generally only used for specific racing
classes.
Break-in - Break-in is the procedure for running a brand new engine
according to specific instructions. This correctly prepares the engine for
normal running. The break-in procedure can be different for differentmakes of engines. Follow the Traxxas directions for break-in exactly.
Carb - Abbreviation for carburetor.
Carburetor - The carburetor atomizes (mixes) the fuel with the air so that
the engine can burn it. There are two types of carburetors, slide carbs and
barrel carbs. The TRX 2.5R uses the superior slide carburetor design.
Clean-out - Cleaning-out is a condition that occurs when the engine is
accelerating and the fuel mixture becomes sufficiently lean to allow the
engine to continue into its upper RPM power band. Usually characterized
by a noticeable decrease in blue exhaust smoke and a dramatic increase in
engine speed.
Combustion chamber - The combustion chamber is machined into thebottom of the cylinder head. This is where the glow plug ignites the fuel.
The shape of the combustion chamber is designed to promote more
efficient burning of the fuel.
Connecting rod - The connecting rod transfers the piston motion to the
crankshaft. The TRX 2.5R Racing Engine uses a knife-edged connecting
rod. The aerodynamic, sharpened edges allow it to slice through the
pressurized air/fuel mixture inside the crankcase.
Cooling fins - The cooling fins are molded into the cylinder head and
crankcase and cause heat to be drawn away from the engine. Heat is
removed when it dissipates into the air passing across the cooling fins.
It is important to keep the fins clean of dirt and debris for maximum
cooling efficiency.
Crankcase - The engine body that contains all of the running
mechanical components.
Crankshaft - The main shaft of the engine that contains the
rotating assembly.Cylinder head (head) - The finned aluminum part on top of the engine that
is responsible for dissipating most of the engines heat. The combustion
chamber is machined into the bottom of the head.
Damper - Another term for shock.
Damping - Resistance force caused by the piston moving through the oil
used to absorb bump and spring rebound energy.
Dyno - Abbreviation for dynamometer. A precise piece of testing equipment
that accurately measures engine power and torque output over the
engines entire RPM range.
EZ-Start - Second generation Traxxas on-board electric starting system. The
system consists of a hand held starter control unit and an on-boardgearbox with an electric motor to spin the engine.
Filter foam - The oiled foam element inside the air filter housing. The filter
foam in the TRX 2.5R Racing Engine must be thoroughly cleaned and re-
oiled after every hour of run time.
Fit - Usually refers to the fit of the piston and sleeve. If the fit is tight, then
the piston will feel very tight at top of the sleeve and the engine will have
good sealing and compression. If the fit is loose, then compression will be
low and the piston and sleeve should be replaced.
Flame-out - Occurs when the engine stops running at high RPM. Usually the
fault of an excessively lean fuel mixture or glow plug failure.
Fuel - (10% 20%) The TRX 2.5R must have model engine fuel to run. TraxxasTop Fuel is recommended. Fuel is sold in quarts and gallons from hobby
dealers. The 10 and 20% labeling refers to the percentage amount of
nitromethane contained in the fuel (see nitro percentagedefinit ion).
Fuel mixture - The ratio of fuel to air as determined by the needle settings
of the carburetor.
Fuel tubing (fuel line) - The thick silicone tubing that carries fuel from the
fuel tank to the carburetor.
Glow plug - The glow plug is located in the cylinder head at the top of the
combustion chamber. It contains a platinum element that glows red hot
20 Revo
The TRX 2.5R Racing Engine
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Revo 21
The TRX 2.5R Racing Engine
when voltage is applied. When the engine is being started, the heat from
the glow plug ignites the fuel mixture and starts the combustion process.
Glow plug driver - This tool clips onto the glow plug and supplies the
required voltage to light the glow plug element. It is also called an igniter.
EZ-Start equipped engines do not require this separate tool.
Header - The aluminum tube that connects the tuned pipe to the engine
exhaust port. The length and diameter of the header must be carefullyselected to extract the most power from the engine.
High-speed needle - Adjusts the carburetors fuel/air mixture at high RPM.
Idle speed - The speed (RPMs) the engine runs at when the transmitters
throttle trigger is at neutral.
Idle speed screw - Located on the carburetor body. This screw adjusts the
idle RPM of the engine.
Lean - A running condition where the engine is not getting enough fuel (for
the available air). Symptoms include engine overheating, or the engine
runs for a short time and then stalls, particularly at high speed. This is a
dangerous condition that should be corrected immediately or it can ruin
your engine.Leaning the mixture - Turning either the high speed and/or low-speed
needle(s) clockwise to decrease the amount of fuel the engine receives.
Low-speed needle - Needle valve that controls the low-speed fuel mixture.
Needle valve - Valve consisting of a tapered needle that closes against a
corresponding seat to regulate fuel flow.
Nitro - Abbreviation for nitro methane, a component of model engine fuel
that improves fuel combustion and power output. Nitro also refers to a
class of RC powered by model engines instead of electric.
Nitro content - The amount of nitro methane used in the fuel. Usually
measured as a percentage of the total fuel volume. Traxxas engines are
optimized to use 10-20% nitro. 30% nitro may be used for racing.Nitromethane - Nitro methane is a component in the fuel that increases
power from the combustion process up to a point. Engines are generally
optimized to use a range of nitro content for the best power.
O-ring - Rubber O-shaped ring used as a sealing gasket.
Pipe - Abbreviation for the tuned exhaust pipe on a nitro engine. See Tuned
Pipedefinition.
Piston - The piston is the internal engine part that is attached to the upper
end of the connecting rod and moves up and down in the cylinder sleeve.
The precise fit between the piston and the sleeve creates a seal that allows
engine to have the required compression for combustion.
Port - Ports are openings in the sleeve that allow atomized fuel to enter the
combustion chamber and burned exhaust gasses to exit. The shape and
location of the ports are a large factor in controlling the engine timing and
power output.
Priming - Manually causing fuel to move from the fuel tank up to the
carburetor. This is sometimes necessary after the engine has been sittingfor a long period of time and all the fuel has drained back to the tank. On a
Traxxas model this is done by holding your finger over the exhaust tip for
one or two seconds while the engine is starting.
Punch - A term that refers to how quickly the model responds to throttle
input or how quickly it accelerates.
Rich - A running condition where the engine is getting too much fuel for the
available air. It is better to run an engine slightly rich to increase engine
life. Excessively rich mixtures cause the engine to have sluggish
performance with exaggerated blue smoke and unburned fuel coming
from the exhaust.
RPM - Abbreviation for revolutions per minute (how many times the enginecrankshaft spins in a minute).
Sleeve - Internal engine part that contains the piston. The precise fit
between the sleeve and the piston creates a seal that allows engine to
have the required compression for combustion. The sleeve in a TRX
engine is made of brass and is then hard-chrome plated.
Slide carburetor - The throttle on a slide carburetor closes and opens by
sliding a barrel in and out of the carburetor body. This type of carburetor is
preferred for performance use because it provides a less restrictive
straight-through air path than the barrel carburetor design.
Stall - When the engine stops running, usually due to an incorrect fuel
mixture setting or running out of fuel.Tuned pipe - The tuned exhaust pipe usually consists of a specially-shaped
metal or composite chamber with baffles that is designed to enhance the
power output of the engine.
Wear-in - Fitment process that occurs during engine break-in where internal
engine parts develop an even more precise matched fit through actual use
under controlled circumstances.
WOT - Abbreviation for wide-open throttle.
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22 Revo
The TRX 2.5R Racing Engine
The Fuel
Use the Right FuelIts imperative that you use the correct fuel in your
TRX 2.5R Racing Engine for maximum performance
and engine life. Traxxas Top Fuel should be used to
ensure correct engine lubrication, performance, and
ease of tuning. Traxxas Top Fuel has been proven inthousands of engines, so you can count on it every day
for great performance.
Top Fuel is the only f uel which is 100% certi fied for use in Traxxas
engines.
Traxxas Top Fuel is made with just the right balance of the highest
grade natural and synthetic lubricants to allow excellent throttle
response and the best top-end performance, without sacrificing
long-term durability.
All of the components in the fuel are carefully selected from the best
materials available and then custom blended to match the
metallurgy and temperature characteristics of Traxxas engines.
You may use 10% or 20% nitro-content fuel. Use the same percentage
all the time; dont switch back and forth between 10% and 20% fuel. If
you break-in your engine on 20% fuel, then always use 20% fuel.
What about Other Fuels?
Can other brands of fuel be used besides Top Fuel? There are other
fuels that can provide satisfactory performance; however there could
be long-term costs in the form of decreased engine performance, loss
of tuning ease, and shorter engine life. Only use fuels that contain both
castor and synthetic oil.
Everyone has an opinion or a claim to make about fuel. The engineering
team at Traxxas spent over 2-years developing the TRX 2.5R Racing
Engine. No one knows more about the specific fuel requirements of
Traxxas engines, than Traxxas engineers. We strongly urge you not to
take chances with your engine investment and use the Traxxas fuel
made for the TRX 2.5R Racing Engine.
Handling the FuelFollow all directions and warnings on the fuel can.
Keep the fuel tightly capped at all times. Some components in the
fuel can evaporate very quickly and upset the balance of the fuel.
Do not store unused fuel in the fuel dispenser. Immediately return
fresh unused fuel back into the fuel can.
Do not mix old and new fuel. Never mix different brands of fueltogether.
Store the fuel in a cool dry location, away from any source of heat,
ignition, or combustion.
Read and follow the safety precautions on page 4 in this
manual.
Filling the Fuel TankUse a fuel dispensing bottle (Traxxas Top Fueler, part
#5001) to put fuel into Revos fuel
tank. To fill the fuel bottle, squeeze
the air out, insert the dispenser tip
into the fuel can, and release your
grip on the bottle. As the bottle
expands, fuel will be drawn into it.
To fill your model, pull up on the
fuel cap handle, insert the tip of the
fuel bottle, and squeeze to dispense
the fuel.
DANGER! Model engine fuel
is poisonous to humansand animals. Drinking the
fuel can cause blindness
and death. Handle withcare and respect. Keep it
out of reach of smallchildren at all times! Whiledriving, do not leave your
fuel dispensing bottle on
the ground where a childcould have access to it.
Follow fuel label warnings.
You may use higher nitropercentages than 20% in
certain circumstances. Call
1-888-TRAXXAS for more
information.
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Revo 23
The TRX 2.5R Racing Engine
The Air Filter
The TRX 2.5R Racing Engine air filter is speci fically designed to deliver
maximum performance while protecting your engine from dust and dirt.
Use only the supplied filter. You will not improve engine performance
by switching to an aftermarket filter , and you may risk engine damage
due to poor filtration.
The TRX 2.5R Racing Engine air filter a ssembly consists of 3 pieces:1. A rubber filter base
2. A plastic housing consisting of a permanently assembled
mesh cap and body
3. An oiled foam element
You must clean the filter after every hour of run time, even if the filter
looks clean. This includes the break-in time. Clean your air filter after
break-in. Dust (which is often too fine to see) and dirt constantly move
through the filter anytime the engine is running. Even if you cant see
dirt on the filter, it is present inside the foam after any amount of run
time. If you exceed the recommended cleaning intervals, your engine
will be damaged. Engine damage or wear due to dirt ingestion is easy todetect, and one of the top causes of premature engine failure.
Air Filter Cleaning Instructions1. Remove the air filter from the
carburetor bore by pulling the
entire filter assembly firmly to the
side to release it. Do not pull
straight up.
2. Disassemble the filter. Pull the
rubber air filter neck out of the
filter body. With the base removed,
the foam element is visible in thebottom of the filter body. Pull out the foam element.
3. Clean the filter parts by thoroughly washing all three pieces of the
filter assembly in hot soapy water (dishwashing detergent works
well). Repeat twice.
4. Thoroughly dry the parts with a clean towel or compressed air.
Remember to wear your safety glasses when working with
compressed air.
5. Oil the foam element with foam filter oil. Use the supplied Traxxas
filter oil (part# 5263) or a high-quality, special-purpose foam filter oil
like what is used for off-road motorcycle and ATV engines.This type
of filter oil is available at motorcycle pro-shops. Apply 30 drops of the
Traxxas filter oil evenly to the top, bottom and sides of the filter
element (30 total drops divided among the 3 surfaces). Squeeze the
filter element repeatedly to help spread the oil throughout. The filterelement should be evenly colored by the oil. Even color indicates
that the oil is distributed evenly. Do not squeeze out excess oil.
Note: Do not use the air filter oil for anything other than the air
filter. It is not meant to be a lubricant.
6. Reassemble the filter and install it on the engine, making sure the
rubber filter neck fits securely on the carburetor with no gaps or
air leaks.
Clean your air filter afterevery hour of run time to
avoid engine damage,
even if the filter looksclean.
If you use compressed air
to dry your air filterassembly, wear safety
glasses and avoid directing
compressed air towardyour skin.
If foam filter oilis not
available, clean 30 or 40weight motor oil can be
substituted, but is not
preferred. Never run theengine without a properly
oiled filter!
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24 Revo
The TRX 2.5R Racing Engine
The Carburetor
Understanding the Carburetor adjustments
The carburetor performs several functi ons. It controls the engine s speed
by restricting the intake of air and fuel into the engine. It atomizes the
fuel (suspends the fuel droplets in the air) and also controls the air/fuel
ratio of the mixture entering the engine (how much air for a given
amount of fuel).
To help provide a better understanding of engine tuning and why its
necessary, the following is a brief explanation of the air/fuel combustion
process that takes place inside the engine.
In order to create the cylinder pressure that results in power, the engine
burns the air/fuel mixture. Both air and fuel, in correct amounts, are
needed for proper combustion. It is the carburetors job to mix the air
and fuel together (atomize the fuel), in the correct proportion for the
best possible combustion. This is the ideal air/fuel ratio. The ideal air/fuel
ratio required for the engine remains roughly constant. Due to variations
in atmospheric conditions (temperature, humidity, altitude etc.) fuel flow
adjustment valves (called fuel mixture needles) are required to meter the
fuel and maintain the ideal air/fuel ratio in these ever-changing
conditions. For example, colder air is more dense (more air molecules)
for a given volume of air and therefore requires more fuel (more fuel
molecules) to maintain the correct air/fuel ratio. Warmer air is less dense
(fewer air molecules) and therefore needs less fuel to maintain the
correct air/fuel ratio. The tuning needles are there to adjust how much
fuel is made available for the carburetor to mix with the available air
(atomization).
The Fuel Mixture Needles
The amount of fuel metered and atomized by the carburetor is
controlled by the two mixture needles, the high-speed needle and the
low-speed needle. The low-speed needle is used to meter the fuel used
by the engine at idle and low RPM (part-throttle) engine speed. The
high-speed needle is used to meter the fuel when the throttle is open
from part throttle to wide-open throttle (WOT). Two needles on the TRX
2.5R Racing Engine provide precise control of the air/fuel ratio across the
engines entire RPM range.
The maximum possible fuel flow is always c ontrolled by the high-speedneedle. It works like the main water valve on a garden hose. Turn it
clockwise to close the valve, counter-clockwise to open it. When the
throttle is at idle or partially open, the low-speed needle again meters
the fuel flow at the outlet (needle seat) where the fuel enters the
carburetor venturi. This second valve acts like the spray nozzle at the end
of the garden hose in our example. When you accelerate from idle, the
throttle opens and the low-speed needle is pulled away from the needle
seat. This allows more fuel to flow with the increased air flow. As the
See page 31 for more
information on how airdensity affects engine
tuning.
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Revo 25
The TRX 2.5R Racing Engine
throttle is increased, the low-speed needle is pulled completely away
from the needle seat leaving it fully open. At that point, fuel metering is
entirely controlled by the high-speed needle. Again, using our water
hose example, when the spray nozzle at the end of our garden hose isfully open, then the main water valve can be used to adjust how fast the
water flows.
The engines performance is directly linked to the fuel mixture.
Richening the fuel mixture increases the amount of fuel in the air/fuel
mixture ratio and leaning the fuel mixture decreases the amount of
fuel in the air/fuel mixture ratio.
Slightly lean fuel mixtures deliver stronger, more efficient
combustion and more power, but with less lubrication.
Slightly rich fuel mixtures deliver cooler running and more
lubrication but with slightly less power.
Tuning the engine means finding the perfect balance between the two;
excellent power to meet your needs while maintaining good lubrication
for long engine life. The optimal fuel mixture setting is rich to provide a
safety margin against having a lean condition if some variable changes
(such as the temperature from one day to the next).
General fuel mixture settings are measured by the number of turns the
needles are turned out from fully closed. The fuel mixture settings have
been pre-set from the factory to typical break-in settings. Do not
readjust your carburetor from the factory settings until after the engine
is started and running, and you have been able to observe the engine
running to assess what minor adjustments may be required to
compensate for fuel, temperature, and altitude. Adjustments are usually
made in 1/8 or 1/16-turn increments.
The Idle Speed Adjustment
The idle speed screw controls the closed position of the throttl e slide.
When the throttle servo is in its neutral position, the throttle slide should
be stopped against the idle adjustment screw. Always use the idle speed
adjusting screw to control engine idle. Do not use the throttle trim on
the transmitter to adjust idle speed. The idle speed should be set as low
as possible and still maintain reliable running.
Water Valve(Controls Overall Flow)
High Speed Needle
Water Nozzle(Controls Fine Flow)
Low Speed Needle
Richen
Lean Rich
See Tuning Your TRX 2.5R
Racing Engine on page 30for complete information on
adjusting the air/fuel
mixture and idle speed.
Factory Needle Settings
If your factory preset
carburetor adjustments
have been tampered with,
use the following settings:
Set the high-speed needle
to 4 turns out from closed.
Set the low-speed needle
so the screw head (red in
Fig. A) is flush (even) with
the end of the slide (yellowin Fig. A).
Always use the factory
settings for initial starting.
Only use these settings
when the factory settingshave been lost.
Low SpeedNeedle Adjustment
Fig. A
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26 Revo
The TRX 2.5R Racing Engine
The Traxxas EZ-Start brings the convenience of push-button electric
engine starting to your Revo. The EZ-Start consists of a hand-held
control unit and an on-board motorized starter.
Power for the EZ-Start system comes from a 7.2-volt rechargeable
battery pack installed in the hand-held control unit (battery
not included).
The engine glow plug is heated automatically by the EZ-Start system,
eliminating the need to keep up with a separate glow plug igniter.
The voltage to the glow plug is kept constant, reg ardless of the load
placed on the starter by the starter motor.
The Glow Plug LED (light emitting diode) on the control unit
indicates the condition of the glow plug.
The Motor LED indicates the status of the EZ-Start electric
starter motor.
The cush drive mechanism in the drive unit prevents damage to thegears caused by engine kickback.
Smart Start protection circuitry prevents damage to the motor by
cutting power if the load on the motor or other electronics exceeds
safe limits.
Installing the EZ-Start BatteryThe EZ-Start system requires a fully charged 7.2-volt rechargeable NiCad
or NiMh battery pack (not included). Use a charger (not included)
designed for 7.2-volt battery packs. Charge the battery according to the
charger manufacturers directions.
1. Press the tab in the end of the battery compartment door to open.
2. Plug a fully charged 7.2-volt battery pack into the connector inside.
3. Twist the battery 2 or 3 times to twirl the battery plug wires. This
helps hold the wire and battery in place when the battery is installed
in the compartment.
4. Install the battery into the compartment and press the wires securely
into place.
5. Snap the battery compartment door back on and lock the end tab.
The Traxxas EZ-Start Electric Starting System
Use the Right Charger
The most convenient typeof charger is an AC peak-
detecting charger that
plugs directly into an ACwall outlet. It contains
special peak-detectioncircuitry that automaticallyshuts the charger off when
the battery is fully charged.
If youre using a 15-minute
timed charger, always fully
discharge the battery packbefore each charge. Some
high mAh battery packs
(1500 mAh or higher)require more than the
standard 15 minutes of
charge time. If the battery
pack is cold after 15minutes of charging, add
another 5 minutes of chargetime. Closely monitor the
battery pack and stop
charging it when it beginsto feel warm to the touch.
Never leave a battery
charging unattended.Always follow charger
manufacturers instructions.
Inexpensive overnight wall
chargers may also be used.
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Revo 27
The TRX 2.5R Racing Engine
Using the EZ-StartYour EZ-Start controller plugs into a 4-prong receptacle in the center of
the pickup bed on your Revo. When the red button on the controller is
pressed, the EZ-Start motor begins to spin the engine and power from
the control unit heats the glow plug. Assuming all settings and
preparations are correct, the engine should start almost immediately.
Each of the two status indicator LEDs onthe hand-held control unit, the Motor
LED and the Glow Plug LED, should
light green while starting. If either LED
fails to light while starting, there is a
fault indicated with that function:
If the Glow Plug LED fails to light,
the glow plug may be bad, or the
glow plug wire may be damaged or
disconnected.
If the Motor LED fails to light and the
starter fails to operate, then the
EZ-Start is in protection mode.
Protection ModeThe EZ-Start uses Smart Start technology to monitor the condition of
the system and detect failures. The controller monitors the load being
placed on the EZ-Start motor. If the load becomes excessive, the system
shuts off power to the motor to prevent costly damage to the motor and
the controller. This may occur, for example, if the engine floods with fuel
during starting. The starter spins at first but when excessive fuel in the
combustion chamber begins to lock up the engine, the starter motor
slows under the heavier load. This causes the protection circuit to shut
off the power to the motor. Allow at least 3 minutes for the starter motor
to cool and the circuit to automatically reset before continuing. Use the
time to find and eliminate the condition that caused the excessive load
on the starter motor.
Shutting Off The EngineTurning off the switch for the radio will
not shut off the engine. To shut off the
engine, use the shut-off clamp on the
fuel line. Simply squeeze the clamp
closed to shut off the fuel supply to the
engine. Dont forget to release it when
you restart the engine.
Avoid shutting off the engine by placing your finger over the exhaust
outlet, especially if you are through driving for the day. This will leave
more unburned fuel in the engine that could lead to harmful corrosion.
Always be careful not to touch the metal exhaust pipe after running, it
can become very hot.
Clearing a Flooded EngineIf the engine is primed for too long during startup, then it can
become flooded with fuel. When the engine is flooded it will no
longer turn due to excess fuel in the combustion chamber preventing
upward movement of the piston. Use the following procedure to cleara flooded engine.
1. Remove the blue glow plug wire.
2. Remove the glow plug and gasket with the glow plug wrench
supplied with your model. A 5/16 nut driver will also work.
3. Turn the model upside down and plug in the EZ-Start controller.
4. Push the EZ-Start button for several seconds to clear the engine of
excess fuel.
5. Turn the model over and re install the glow plug and gasket.
6. Reconnect the blue glow plug wire to the glow plug.
7. Reconnect the EZ-Start controller
8. Do not prime the engine. Pull the throttle to 1/2 throttle and push the
EZ-Start button. The engine should start immediately.
Motor
MooGlow
GowPlug
PuMotor
Glow
Plug
Motor
Glow
Plug
Motor
MooGlow
GowPlug
PuMotor
Glow
Plug
Motor
Glow
Plug
Motor
MooGlow
GowPlug
PuMotor
Glow
Plug
Motor
Glow
Plug
When the EZ-Start
controller is in protection
mode, wait at least threeminutes before attempting
to start the engine, to give
the starter motor time
to cool.
Its normal for your EZ-Start
controller to become warmafter repeated use.
T TRX 2 5R R E
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28 Revo
The TRX 2.5R Racing Engine
See Important Points to
Remember on page 4 forother precautions.
Never run your Revoindoors. Since the TRX 2.5RRacing Engine exhaust
fumes are harmful, always
run your Revo outdoors, ina well-ventilated area.
Your TRX 2.5R Racing
Engine doesnt usuallyrequire priming. If you do
need to prime your engine,
watch the fuel line carefully
to avoid flooding yourengine. See page 27 for
information on clearing aflooded engine.
Factory Needle Settings
Your carburetor is preset at
the factory to give thecorrect air-to-fuel ratio and
idle speed for engine break-
in. Do not adjust thecarburetor unless you
observe a poor runningcondition that requirescorrection (see page 25 for
stock settings).
Breaking in Your TRX 2.5R Racing Engine
The TRX 2.5R Racing Engine uses a ringless, aluminum-brass-chrome (ABC)
piston/sleeve construction. This type of engine design relies on a very
precise running fit between the piston and sleeve for cylinder sealing.
Engine break-in is necessary to allow the piston and sleeve to develop
an extremely precise fit and optimum cylinder sealing. Therefore,
proper engine break-in is critical to achieving the fastest, most reliable
engine performance.
Allow yourself about 1 to 11/2 hours to complete the break-in procedure.
The engine break-in period will take 5 tanks of fuel in a Revo. The break-in
time is not the time to impress your friends with your new Revo. You must
wait until the engine is fully broken in before attempting sustained high
speed running. Patience and careful attention during break-in will reward
you with the best-performing TRX 2.5R Racing Engine possible.
During break-in, your engine may appear to malfunction with symptoms
like stalling, inconsistent performance, and fouled glow plugs. These are
simply the normal break-in pains engines sometimes go through. They
will disappear once your engine is fully broken in. Many owners report notexperiencing any of these symptoms with the TRX 2.5R Racing Engine. We
recommend to go ahead and replace the glow plug with a new one
after the engine break in procedure.
Engine Break-in ProcedureThe focus during break-in is to vary and limit the engine speed. This will be
accomplished by accelerating and stopping at different rates for the first 5
tanks of fuel. As the engine begins to break-in, the duration and intensity
of the acceleration will gradually increase. Sustained high-speed running
is not permitted until the 6th tank of fuel. Perform the initial break-in on
a large, flat, paved surface. Apply all throttle and braking actions gently.
Abrupt acceleration or braking could cause the engine to stallunnecessarily.
Special break-in fuels are not recommended. Use the same fuel you
plan to use everyday.
If possible, avoid breaking-in the engine on extremely hot or cold days
(see page 32).
Pay careful attention to the fuel level. Do not allow the fuel tank to run
completely empty. An extremely low fuel level causes the mixture to
run too lean. This could result in a burned glow plug or extremely high
engine temperatures.
Do not attempt to break in the TRX 2.5R Racing Engine by idling it on a
stand. This will produce poor results.
Keep extra Traxxas glow plugs (part #3231 or 3232) handy. The break-in
process can cause deposits to form on the plug leading to plug failure.
Change or clean your air filter after break-in.
Follow the instructions exactly for each of the first 5 tanks of fuel.
Starting Your TRX 2.5R Racing Engine for the First TimeBefore you start your TRX 2.5R Racing Engine for the first time, make sureyou have read all instructions and precautions in this manual. Pay close
attention to the tank-by-tank break-in instructions in the next section,
and make sure you have read and understood them before you run
your engine.
Your engine must be at room temperature (70F or 21 C) or above the
first time you start it. If its cooler than room temperature outside, keep
your Revo indoors until youre ready to start it and then take it outside. If
its colder than 45 degrees, special considerations should be made. See
cold weather break-in on page 32. We do not recommend running the
model in temperatures below 35 degrees.1. Turn on the radio system (see page 16).
2. Make sure the throttle trigger on the
transmitter is in the idle (neutral) position.
3. Connect the EZ-Start controller according to
the instructions on page 27.
4. Press the starter button in short two second
bursts and watch for fuel moving through the
fuel line up to the carburetor. Watch closely!
The fuel moves very fast. If the fuel doesnt move through the line
within 5 seconds, prime the engine by briefly (one or two seconds)
covering the exhaust outlet with your finger until the fuel is just visible
in the carburetor fuel line. Watch carefully! If the engine is primed too
long, it will flood with fuel and stop turning.
5. Once fuel reaches the carburetor, the engine should quickly
start and idle.
6. Disconnect the EZ-Start controller from the model.
7. Proceed with the engine break-in.
8. Do not rev your engine with no load (wheels off the ground).
If your engine doesnt start, refer to the TRX 2.5R Racing Engine
troubleshooting section at www.Traxxas.com. If you still have problems,
contact Traxxas Customer Support at 1-888-TRAXXAS.
The TRX 2 5R Racing Engine
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Revo 29
The TRX 2.5R Racing Engine
High Altitude Operation:
If you live in a high altitude
region (5000 or more feetabove sea level), the lower
air density may require you
to lean your high-speed
fuel mixture slightly fromthe factory break in
settings. Try this if you areexperiencing difficult
starting or extremely
sluggish engineperformance at high
altitude.
As you gain experience in
the hobby, you maydiscover that many peoplehave differing opinions on
what is the proper
procedure to break-in amodel engine. Only use the
Traxxas break-in procedure.
Other break-in procedurescould result in a weak,
damaged, or otherwise poor
performing engine. Theprocedure outlined here
was extensively tested and
proven to yield better
performing engines thanother common break-in
methods. Even if you haveyears of experience using
model engines, please do
not ignore this caution!Tank
1
2
3
4
5
Throttle
1/4
1/2
1/2
Full
Full
Time
2 Seconds
2 Seconds
3 Seconds
3 Seconds
5 Seconds
Cool
15 Minutes
15 Minutes
-
-
-
Body
Off
On
On
On
On
Notes
Apply throttle gradually.
Apply throttle gradually.
Reduce idle speed if necessary.
Do not allow shifting to high gear.
Accelerate over 3 second count, hold for 2 seconds.
Tank 1
1. Drive the model with the body off.
2. Driving procedure: Gently pull the throttle trigger to 1/4 throttle
over a 2-second count. Then gently apply the brake to stop . Count
the two seconds out while accelerating: one thousand one, one
thousand two, and then stop. Operate the throttle trigger as
smoothly as you can. Repeat this starting and stopping procedure
until the first tank of fuel is nearly empty.3. Look for thick blue smoke exiting the exhaust outlet. If there is no
smoke, richen the high-speed needle 1/4 turn, by turning the needle
counterclockwise.
4. When the fuel tank is nearly empty, shut off the engine by pinching
the fuel line connected to the carburetor (use the installed clamp).
5. Let the engine cool for 15 minutes.
Note: If at any point the engine cuts out or stalls during gentle
acceleration, richen the high-speed needle 1/4 turn by turning the
needle counterclockwise.
Tank 2
1. From tank 2 forward, Revo should be driven with the body on.
2. Driving procedure: Gently pull the throttle trigger to 1/2 throttle
over a 2-second count. Then gently apply the brake to stop. Count
the two seconds out while accelerating: one thousand one, one
thousand two, and then stop. Repeat this starting and stopping
procedure until the second tank of fuel is nearly empty.
3. When the fuel tank is nearly empty, shut off the engine and let it cool
for 15 minutes.
Tank 3
1. Driving procedure: Gently pull the throttle trigger to 1/2 throttle
over a 3-second count. Then gently apply the brake to stop. Count
the three seconds out while accelerating: one thousand one, one
thousand two, one thousand three, and then stop. Repeat thisstarting and stopping procedure until the third tank of fuel is
nearly empty.
2. As the engine loosens, the idle speed may increase and cause the
model to try to creep forward when stopped. Reduce the idle speed
by turning the idle adjustment (see page 19) on the carburetor
counterclockwise.
3. When the fuel tank is nearly empty, shut off the engine and refuel.
From here on, you do not need to let the engine cool between tanks.
Tank 4
1. Driving procedure: Gently pull the throttle trigger to full throttleover a 3-second count. Then gently apply the brake to stop. Count
the three seconds out while accelerating: one thousand one, one
thousand two, one thousand three, and then stop. Repeat this
starting and stopping procedure until the fourth tank of fuel is
nearly empty.
2. Apply the throttle gradually! Your finger should not reach full throttle
until the end of the three-second count. Revo may try to shift into
second gear. If it does, reduce the throttle input. Do not let Revo shift
out of first gear.
3. Keep your driving smooth and consistent.
4. When the fuel tank is nearly empty, shut off the engine and refuel.
Tank 5
1. Driving procedure: Gently pull the throttle trigger to full throttle
over a 3-second count, hold for 2 more seconds, and then gently
apply the brake to stop. Count the five seconds out while
accelerating. Repeat this starting and stopping procedure until the
fifth tank of fuel is nearly empty.
2. The model should now be shifting into second gear. If it is not, try
turning the high-speed needle clockwise 1/8 turn to lean the fuel
mixture slightly and test for shifting.
3. When the fuel tank is nearly empty, shut off the engin